Fire-tube steam boiler



Dec. 23, 1930. s. w. RUSSELL 1,786,317

1 FIRE TUBE STEAM BOILER Filed Marh 15, 1928 lit.

OIdFOrm 1 V Patented Dec. 25, 1 930 nnirn srars wrmmmnmmm main FFicEGannon w. RUSSELL, or BROOKLINE, .MAssAon snTTs, ASSIGN R TO JAMESRUSSELL BOILER WORKS 00., A CORPO ATION OF nAssAcirUssTTs' FIRE-TUBESTEAM BOILER Application filed March 15,1928. Serial NO. 261,784.

ihis invention relates to steam boilers of the fire tube type such asare commonly used for heating houses and public buildings.

In boilerpractice in this particular field especially there has longexisted a serious diliiculty in providing a satisfactory installation ofa heating system where the head room, that is,'th e available spacebetween floor and ceiling of the boiler room,'is insufficient to providean adequate difierential or. head between the first floor radiator andthe water line of a boiler having sufiicient capacity to adequately heatthe building, Too

limited a head or elevation of the'radiators above the water line of theboiler involves a backing up of the water into the radiator intakes,thus clogging circulation of steam with consequentinsufliciencyof heatand ineiiicient burning of fuel. 7

In such situations it has been customary to resort to a circulatingforce pump which not only adds to the cost of the system and to theexpense of operation but is not'entirely satisfactory.

To remedy this trouble, I have devised a new construction of boilerwhich, without impairing the boiler capacity, provides a boilerconstructionthat permits a very substantial head room between thewaterline and the radiator intakes but without impairing its capacity, whileat the same time increasing its efficiency as compared with the oldcircular type of horizontal fire tube boiler.

In general, the invention comprises a boiler of substantial ellipticalshape in cross section, with major axis of the ellipse extendedhorizontally across the boiler, while the short axis is in a verticalplane, the top and bottom walls of the boiler being secured together atsuitable intervals to impart the necessary strength or resistance topressure.

In the accompanying drawings 1 have section through the fire boxillustrating the same construction.

Fig. 3 is a diagrammatic view illustrating thedifference in water lineandconsequent difference in head between my construction of boilerand aprior art circular boiler of equal capacity. 7 V

In the accompanying drawings the boiler shelll is of elliptical shape incross section and is provided rearwardlyof thefire box 2 with a seriesof fire tubes 3 extending into a vertical passage at the rear end of theshell so as to allow the combustion gases to'return through the returnfire tube't to' the Ofi'take stack 5 of the boiler.

The crown sheet 6 has acorrespondingly fiat curvature and, at its sidesis continued down as at (i to form a water leg on each side of the firebox.

To adequately sustain the top and bottom walls of the boiler-shellagainst pressure, a

series of vertical stay-rods 8 are securely anchored to these walls,while the forward. portion of the boiler above the fire box has a:

. radiator intakes that'is derived from an ado-ption of my construction.The circular dotted line with its downward vertical continuations showsthe outline of a boiler having the same capacity as the outline ofboiler shown in full linesin said figure, following the practiceembodying my invention.

In a boiler of eighty horse power capacity, there will be an actual gainin head room of about fifteen inches, assuming the two types of boilerto be set on the same base or floor level. Moreover, the ellipticalprinciple,involving as it does the relatively wide and vertically shortseries of lire tubes, gives thefire more direct access to the interiorof the fire tubes which makes for further efficiency in the generationof steam series of shorter stay-rods 9 tightly connectj What I claim is:

A fire tube boiler embracing in its construction a boiler shell ofelliptical cross section with the major axis of the ellipse extendr inghorizontally, a lire box located at the lower forward encl of the shelland partitioned at its top from the overhead semielliptical upper halfof the boiler shell by an upwardly arched crown sheet, a series of fire10 tubes extending directly from the rear of the the box to the rear endportion of the boiler, a series of return tubes arranged above the h elof the crown sheet and extending the hole length of the boiler, andvertical stay rods passing between both sets of fire tubes and tieingthe top and bottom walls of the ellipse to resist the pressure of theinternal body of steam.

in witness whereof, I have subscribed the 29 abore specification.

GORDON N. RUSSELL.

